jQuery.cookie = function(name, value, options)
{
    if(typeof value != 'undefined') //set cookie
    {
        options = options || {};
        if(value === null) // 移除cookie
        {
            value = '';
            options = $.extend({}, options);
            options.expires = -1;
        }

        var expires = '';
        if(options.expires && (typeof options.expires == 'number' || options.expires.toUTCString))
        {
            var date;
            if(typeof options.expires == 'number')
            {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            }
            else
            {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString();
        }

        var path = options.path ? '; path=' + (options.path) : '';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    }
    else  // get cookie
    {
        var cookieValue = null;
        if(document.cookie && document.cookie != '')
        {
            var cookies = document.cookie.split(';');
            for(var i = 0; i < cookies.length; i++)
            {
                var cookie = jQuery.trim(cookies[i]);
                if(cookie.substring(0, name.length + 1) == (name + '='))
                {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
};
